telescopecomparison · 2-way
Celestron EdgeHD 9.25 vs Celestron RASA 14
Celestron
EdgeHD 9.25
Best suited for experienced imagers chasing detail running a backyard imaging setup.
Celestron
RASA 14
Best suited for intermediate imagers building a versatile kit running a permanent observatory setup.
Key differences
+197% focal length
-34% aperture
Slower by 7.8 f-stops
Specifications
| Specification | Celestron EdgeHD 9.25 | Celestron RASA 14 |
|---|---|---|
| Optics | ||
| Type | SCT | astrograph |
| Optical design | Aplanatic SCT | Rowe-Ackermann Schmidt Astrograph |
| Aperture | 235mm | 356mm |
| Focal length | 2350mm | 790mm |
| Native f/ratio | f/10.0 | f/2.2 |
| Image circle | 42mm | 52mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 9.5kg | 30.0kg |
Advantages of Celestron EdgeHD 9.25
- Tighter framing — 2350mm vs 790mm focal length
- Lighter (9.5kg vs 30kg) — easier to travel with
Advantages of Celestron RASA 14
- Wider field — 790mm vs 2350mm focal length
- 51% more light-gathering aperture
- Faster optics at f/2.22 vs f/10
- Larger image circle (52mm) — supports bigger sensors
Best for — Celestron EdgeHD 9.25
- Small galaxies, planetary nebulae, lunar & planetary detail
- High-resolution long-exposure work
- Faint-object imaging under dark skies
- Full-frame astro cameras and DSLRs
Best for — Celestron RASA 14
- Medium-sized galaxies and planetary nebulae
- Fast imaging — short exposures per sub
- Faint-object imaging under dark skies
- Full-frame astro cameras and DSLRs
Celestron EdgeHD 9.25 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 0.88° × 0.59°Scale: 0.33"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 0.57° × 0.38°Scale: 0.33"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.28° × 0.28°Scale: 0.33"/px
Celestron RASA 14 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 2.61° × 1.74°Scale: 0.98"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 1.70° × 1.14°Scale: 0.98"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.82° × 0.82°Scale: 0.98"/px
Celestron EdgeHD 9.25 — recommended user
Best suited for experienced imagers chasing detail running a backyard imaging setup.
Celestron RASA 14 — recommended user
Best suited for intermediate imagers building a versatile kit running a permanent observatory setup.